3Com WX4400 Reference Manual page 85

Delete all workspaces or paper layouts that are not required. If the
drawing contains multiple paper layouts, delete all but the last one
(which cannot be deleted) and delete the contents of that layout.
Check for externally referenced files. 3WXM requires the drawing file
to be monolithic. If a floor plan uses externally referenced files,
significant portions of the floor plan might be missing, even with all
layers unfrozen and visible.
In AutoCAD, when you load the drawing file, you might see messages
about the files not being found. To check for external references, you can
select Insert > Xref Manager. If you look at the layers, externally
referenced layers have a common prefix label with the $ delimiter
between the label and the description (for example, SC03$a-WALL-FULL).
If you can see the layer itself, the layer either will be blank or will be a
single read-only object.
To include the information in externally referenced files, place the files in
the same directory as the master file. In AutoCAD, you also can bind the
information to the master file by selecting Insert > Xref Manager,
selecting the file, then clicking Bind.
Adding information from referenced files can increase the file size. If the
information you will need to convert into RF obstacles is in the referenced
file, but not the master file, try just importing the referenced file into
3WXM. For information on the location of referenced files in AutoCAD,
see the AutoCAD documentation.
Audit the drawing. An audit finds problems between objects in the file
and fixes them automatically. To perform an audit in AutoCAD, select
File > Drawing Utilities > Audit.
Check for grouped objects, especially groups that span multiple layers
or include the entire drawing. If a grouped object contains objects that
you will to assign differing RF values to, or if some objects will not
become RF obstacles, ungroup the objects and delete the unneeded
objects. If all of the RF objects in the grouped object will have the
same RF value, you might want to leave the object grouped.
A grouped object can contain multiple layers, and can contain visible
and invisible objects. (When you select an object that spans multiple
layers, the object is not selected normally when you click on it.
Instead, a selection square appears, offset to the side of the object.)
Importing or Drawing Floor Details 85